Overview
The AD774BAR is a complete 12-bit successive-approximation analog-to-digital converter (ADC) produced by Analog Devices Inc. This monolithic IC integrates a high-precision voltage reference and clock, making it a self-contained solution for analog-to-digital conversion. The AD774BAR is designed to be pin-compatible with the industry standard AD574A but offers faster conversion times and lower power consumption. It operates on +5 V and ±12 V or ±15 V power supplies and is available in a 28-lead SOIC package.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 12 bits |
| Conversion Time | 8 µs (maximum) |
| Temperature Range | –40°C to +85°C (A and B grades) |
| Power Supplies | +5 V, ±12 V or ±15 V |
| Package Type | 28-lead SOIC |
| Analog Input Ranges | 0 V to 10 V, 0 V to 20 V (unipolar); –5 V to +5 V, –10 V to +10 V (bipolar) |
| Digital Interface | Three-state output buffers, direct connection to 8- and 16-bit microprocessor buses |
Key Features
- High-precision voltage reference and clock integrated on-chip.
- Fast conversion time of 8 µs (maximum).
- Low power consumption.
- Industry standard pinout compatible with AD574A.
- Active laser trimming of thin-film resistors for minimized offset, linearity, and scaling errors.
- Flexible digital interface with multiple-mode three-state output buffers.
- Operates on +5 V and ±12 V or ±15 V power supplies.
Applications
The AD774BAR is suitable for a variety of applications requiring high-precision analog-to-digital conversion, including industrial control systems, medical devices, data acquisition systems, and any environment where fast and accurate conversion is necessary. Its compatibility with various microprocessor buses makes it versatile for integration into different system designs.
Q & A
- What is the resolution of the AD774BAR?
The AD774BAR has a resolution of 12 bits. - What is the maximum conversion time of the AD774BAR?
The maximum conversion time is 8 µs. - What are the operating temperature ranges for the AD774BAR?
The operating temperature range is –40°C to +85°C for A and B grades. - What power supplies does the AD774BAR require?
The AD774BAR operates on +5 V and ±12 V or ±15 V power supplies. - In what package type is the AD774BAR available?
The AD774BAR is available in a 28-lead SOIC package. - What are the analog input ranges for the AD774BAR?
The analog input ranges include 0 V to 10 V, 0 V to 20 V (unipolar), and –5 V to +5 V, –10 V to +10 V (bipolar). - Is the AD774BAR compatible with microprocessor buses?
Yes, it has a flexible digital interface with multiple-mode three-state output buffers for direct connection to 8- and 16-bit microprocessor buses. - What is the significance of the laser trimming in the AD774BAR?
The active laser trimming of thin-film resistors minimizes offset, linearity, and scaling errors. - Is the AD774BAR still in production?
No, the AD774BAR is obsolete and no longer manufactured. - What are some potential substitutes for the AD774BAR?
Available substitutes can be found through the manufacturer or distributors, as the AD774BAR is no longer in production.
